VL(left)M1

Cell lineage of regularly developing sea urchin embryo: VL(left)M1

Cell name	VL(left)M1
Cleavage number	5
Number of cells after cleavage	32
Cleavage direction (with respect to the A/V axis)	vertical
Mother cell	VL(left)M
Sister cell	VL(left)M2
Progeny	VL(left)M1u, VL(left)M1l
Tier
Prospective territory